Telephone desk-set apparatus and circuit.



B. W. SWEET.

TELEPHONE DESK SET APPARATUS AND CIRCUIT.

AYPLIOATIOX PILED 33.27. 1906.

Patented Dee.2o,1910.

faz/ 5212523 g Burton' Z/z/.

MMWMM UNILTED ST; PATENT OFFCE.

BURTON W'. SXVEET, OF CLEVELAND, OHIO,

ASSIGNOR. BY MESNE ASSIGNMENTS, T0

CENTURY TELEPHONE CONSTRUCTION COMPANY, OE BUFFALO, NEW YORK, A. COR- POIt-ATION OF NEW YORK.

Specification of Letters Patent.

Patented Dec. 20, 1910.

Application filed April 27, 1906. Serial No. 313,930.

[o a!! 257mm ii may concern.

Be it known that I, BURTON lV. Qwvizrxr, a citizen oi' the United States of America, and a resident of Cleveland, in the county of Cuyahoga and State ot' Ohio, have invented certain new and useful improvements in Telephone Desk-Set ^\ppaiatus and Circuits, of which the following is a specification.

My invention relates to improvements iu telephone desk-set. apparatus and circuits, and has for its object, the improvement ot' this class of apparatus in such manner as to mal-:e it more compact and better adapted for ordinary service.

In this class ot' apparatus, it is highly desirable thatA the construction shall be as compact and light in weight as it. is possible to make serviceable and satisfactory instruments, for the reason that telephone desk-sets are intended to be placed immediately beside the user, and most frequently are held by him in the talking position. Consequently, a large unwieldy or heavy instrument is out of the question. Moreover, by reason ot the fact that the receiver and transmitter are carried from the top of the standard, a desk-set demands a construction which is relatively low, and ordinarily is provided with a shallow flattened base, to the end that the instrument shall notbe top-heavy or easily overturned. Practically all or' these attributes are also required of such desk-sety instruments as are intended to be mounted at the end ot a supporting arm. Again, in desk-set instruments, a very frequent source of trouble is found in the. ilexibie conducting cords extending the telephone circuits to the instrument. and l have sought to minimize this trouble by reducing the number of such cords carried to the instrument, and proportionally obviating such trouble. This, l have accomplished by means of a specially Constructed induction coil, which I mount l within the lower portion of the tubular standard of the desk-set, and being contained within the instrument and intimatel)r associated with the circuit-changing springs thereof, serves to reduce the number ofcouduetiug cords otherwise required for completing the. necessary electrical circuits, and insuring more permanent connections, both l -interiorly and exteriorly of the telephone instrument.

)fly sa id improvements will be more readily understood by making reference to he accompanying sheet of drawings, setting forth apparatus embodying my invention, wherein.;-

Figure I. is ar View in rear elevation of a telephone deslcset. Fig. ll. is a side View of the inner tubular standard, partially broken away. Fig. lll. is a vertical section, and Fig. lV. a transverse section of the induction coil, respectively on lines 1/y and Fig. V. is a View in elevation of the same device, broken away at the top (the three latter Views being upon a cousiderably enlarged scale.) Figs. YI. and Vil. respectively are diagrams showing the circuits of local and common battery desksets equipped with myinvention; and, Fig. Ylll. is a view in elevation of a compact self-contained desk-set, carried at the end of a pivoted supporting-arm.

Throughout the several figures of the drawings. l have'employed the same character of reference to indicate similar parts.

The telephone desk-sets or instruments, Figs. l and Vlll. are provided with outer tubular sleeves or uprights a removably supporing the standards /z mounting as a unitary structure the telephonie and switching apparatus ot' said instruments. ln the tirsi named instrument, said upright is mounted upon a low lla'ty base, while in the second type, it is carried at the end of a -bracket arm.

Referring to Fig. il., it Will be seen that the inner tubular standard a of the desk-set, carries a central block l) of insulating matcrial` wherein the short. vertically-positioned switch springs r c' are mounted. These are adapted to be actuated into and out of contact. b v means ot' the insulating sleeve d, vertically moved b v a plunger cl', which is connected with the switch-hook c, provided normall)v to support the receiver c. Beneath the block L. through which the terminals of the switch-springs extend, is provided an induction-coil f of compact construction, and fitting closely within the tubular standard. At. the upper end of said coil, are permanent connections or terminals j respectively extending to the inner Contact springs, and to gram. Fig. \'ll, duction-coil. in this instaure; .a divided into two parts. while the seconi'lary f2 is only in- Y ing picked up and dropped baelt upon the dealt or support. it has been found that a speeially constructed induction-coil is very desirable. it' not neces-wary. for this purpose. Thi.- eoil is formed ot' two inaulatiug heads j. j. suitably bored to teeeive a tube which is interiorly hanged or expanded at ita ends to enter the t'iber inaulation. X bundle ot iron wire is then placed in the tube. and small (lished metal raps m are inserte-.l at either end. as indu-ated in the upper part of Fig. Y. and then t'lattened down upon the tulr and its contained wire core. thug expanding the disks to engage the liber insulating heade and lirntly hold the parts together. The windinga n n ot' the coil are then ptit on in the usual manner. and the proper circuit terminal v are irounte'd in the fiber heada` at either end. Thu; voui-'fruction atl'ords a very simple. cheap and compact induction-toil for use in Such association :as herein set forth.

in the diagram'indicating the desk-ser. Circuits. o o indieate the tertuiintlav from whi-'h the flexible ront'luctiug-f-ord /1 extenos to connect the instrument with the external eircuit. ln a eonnuon battery in trmuent.su(:h as set t'orth in li and Vll.. for example. a single two-.strand conducting-cord is required. as. opposed to three or more strands needed with an instrument assof'iated with an external induction-coil. in a local battery instrun'ient. such as delineated in Fig. Vl.. a three-Strand conducting-cord'is used. as opposed to four or more strands otherwise required where my invention is not employed.

ln Fig. VIH.. I have shown th-L extremity of a braeket-ariu y. serving to mount a telephone desk-eet of my invention. which employa the contained induction-coil.. and eensequently requires only a two or three strand eondueting-rord. ab the -ase may be. to eonneet the instrument in circuit.

From the foregoing, it will be readily appreeiated. that my improvements permit of mountingr the neees'sary induction-coil directly within the tubular standard and m near association with the switch-springs thereof. whereby an extremely compact instrument is seeured. as is emphasized by the structures of l" H and VIH. It will be seen that were the attempt made to mount the'trauamitter gf. aa indicated in the dia- The primary j ot the mthe induetion-eoil in the bai-1e of tht` instrunient. it would be neee ary to increase the height thereotA very materially, thereby adding to the siz and eumbersomy appearance of the instrument and raising;- the center ot gravity thereol. which 1n turn would demand a very material increase in the weight provided in the base. toneequertly, by employing very short' Switch-springs and actuating' mechaniam. and poeitioning the inducs tion-coil within the bore of the standard. im-

mediately adjacent thereto.v l am enabled to prodiu'e a .-elt-etmtained inatrument of ordinarily small size. which requires no additional conductors in the lexible conduetingcord to maintain eircuit with the telephone line and associated apparatus. Ot' course. whereno Supporting' bape is provided. as in Fig. Yill.. there would be no possibility of utilizing7 auch part for containing the induetion-eoil and cord and coil-terminals.r y imprm'elnents. however. permit of a selteontained instrument ot this type. a5 well. without adding a cumbersome containingpart. or inereaeing its weight.

Havingr now described apparatus; embodying niy invention. l claim, and desire to Yeeureby Letters Patent. the Jfolloyvingig l. rl`he combination with a tubular standard mountingl the colwratingr elementaI ae a .-ub-tantially unitary Structure. comprising)y a teiephone transmitter mounted thereon. a telet)lione-hook. -switch mechanism actuated thereby. a telephone receiver normally hungl upon the hook. an induction-coil electrie: lly eonnected with said reeei'.'er and mounted within the tubular standard. whereby all otl A aid parta areinnlted in removable resatiou. and a supportitlg-base adapted removably to mount the standard. substantially as et forth.

2. In a telephone instrument. the Combination with a tubular standard mounting the coipe atingr elements as e. substantially unitary Structure. comprisingr a telephone transmitter and reeeiver supported thereby. a switeh-lever pivoted to said Standard.switch- ;-prings positioned in the upper part ot' said standard. and adapted to be actuated by the lever. and an induction-Coil positioned withiu the standard benath the switch-Springe. terminals prov'ded thereon eonreetingr repeetively with the external circuit and directly with the switch-spring?. and a Separable supporting' member for said tubular Standard. substantiall' as Set forth.

1%. In a telephone desk-instrument, the Combination with a snitably-supported tubular Standard mounting,r the cooperating elenients as a substantially unitary Structure,

comprising a transmitter and receiver earried from the upper portion thereof, a switch-lever pivoted within the said standard. relatively short switch-Springs positioned within the standard adjacent to the switch-lever anrl actuated thereby, and :in induction-ruil tlispogml within thtl stantlartl :intl lit-rnnxntutly connut-teil with tht, switt'h- G. ln a'telephone instrument of the clam tltsoribotl. tho combination with a suitably- ,s-upportotl tubular standard mounting tibi.

. Hit-ings. tht` trtu'tsinitter :intl receiver. turniitar \v Strut-turc. (-oinpriing' a trzinSnutte :incl

insti-union! nuls proi'itit-tl upon tht induction-coil maintaining!" saifl muinmftions :nul thtx t'unutrtioihl with tho external (3m-iut. :unl a svparahltv Nxpport'ing uuunbor tot' saitl tubulnr statutartl. substantially as .set fan-th.

4. 'l`h0 t-ouibination with zt telcphoutx deskluwing a uhulai Staudartl mounting tho copvrating eltiueus :is a sul tantinll'1v unitary trut'ture. t'oniprising :in iuiliu'tiou-t'oil vtrtitntlly positionotl within the Siautlartl. comprising' insulatiiig-heads. a

ttaugotl tubular ort^uiotulwr ongiging sairl ltr-atta. a sott iron con` tli pof sti therein, tislt'r :it cithtr mul ot' said ore oxpuntlotl to tugago such insulating-bowls. and prin-nir)v :enti sot-ontlarj; windings of inrlneal wire. disposed upon tho t'oru. :tml a switch autl Sii'itt-h-:u'tuuting' invrhzxnisui iuonuttfl upon thtl Maintal-tl :uljat'out to tht` coil and electrit'nlli' t'ounortotl tlurowith. snlitnntiully :is Stt forth.

. `lu a toluphoutl tlrslt-instrument. the

combination with suitable supporting utaus.

'thrtctly connected thtrcto, terminals upon of :tu upright or stuutlzutl forming a salt'- t'ontaiuttl instruiucut removable therefrom, rompi-nlug* a transmitter :intl

niouutetl tlwroou, a pii'otml sw'itCh-lever.- short i'vrtit'ally positionml' switt'h -spiiugs voutrollvcl b v said liever, an iut'luftiGn-coil disposta] within thvl standard. pei-nutrienti rountctioml unitingr the rcspertii'e wiutliug ot' tht mil with tho trziuSuiittor. rttcivcr :intl .vit'oli-sln-iugs, anfl tol-mitral; provitlctl upon saiitl oil tot' maintaining`r connection with The oxtvrior cirtfuit, whereby tho number of rvouirwl flexible Cot-,-tontiuttoi-S is rctluferl. Substantially aS #et fortln troipt 'ating clouiouts as :t subtantiall)y unirtt'cii'or uornmlly supportotl from tho tippt-r @ntl thortot'. a switch-lover, lhort ifortioallypositioned switch-springs within thtl l tautlartl niouutctl to bo actuated by Sziitl lever, :zu in hution-coil rort'icalli' ponii'tionud \\ith in tho standard adjacent to the Switchsprings having' insulating-licafl. terminals` niountotl upon sziitl heads ropcctively in pt riuantnt connut-tion with the Switch-Springs, transinitte :nul rcroivor autl with the exten nal circuit, whvreby :i lf-contained inst-ruuient requiring' a Stuall nlnnbtr of tltxible Cortlroutluctorh is obtainvtl. nutl a Soparablo supporting nwinlwr for said tubular stantlzirtl. substantially as Sift forth.

T. ln a ttluphouc (losk-sot. the combination with a tubular Stantlartl-member, of a transmitter and switoh -hoolt supported thereon, switch-Springs iusulzitiuggl)v mountotl within the upptr portion of saitl Stautl- :i1-tl. an inclut-tion coil disposed within the Standard bonoath Saitl switch-springs unil tho coil tor establishing Such connet'tious, oord-ot'nitlutttrx extending within the tubular Stantlartl to the induction-coil and a base removably Supporting the standard, substantiall),v as set forth.

Signed at Cleveland, this 25th (lay of April, A. D. 1906in the presence of the undersigned witnesses.

BURTOX NV, SWEET.

'itnesses Joux l". MCDoNNELL, Mineur LYNN L twiu-:Ncn 

